28415287 has 2 divisors, whose sum is σ = 28415288. Its totient is φ = 28415286.

The previous prime is 28415249. The next prime is 28415293. The reversal of 28415287 is 78251482.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28415287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28415207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14207643 + 14207644.

It is an arithmetic number, because the mean of its divisors is an integer number (14207644).

Almost surely, 2^28415287 is an apocalyptic number.

28415287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28415287 is an equidigital number, since it uses as much as digits as its factorization.

28415287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 37.

The square root of 28415287 is about 5330.5991220500. The cubic root of 28415287 is about 305.1527927446.

It can be divided in two parts, 2841 and 5287, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 28415287 in words is "twenty-eight million, four hundred fifteen thousand, two hundred eighty-seven".